Arnica parryi |
Arnica rydbergii |
|
---|---|---|
nodding arnica, Parry's arnica |
Rydberg's arnica, subalpine arnica, subalpine leopardbane |
|
Habit | Plants 15–50(–60) cm. | Plants 8–35 cm. |
Stems | simple or branched among heads. |
(branches from rhizomes) simple. |
Leaves | (2–)3–4 pairs, basal and cauline (basal usually withered by flowering, petiolate or subsessile, blades ovate or nearly round to oblong-ovate, much smaller than cauline; sterile rosettes often present, proximal cauline often crowded toward stems bases); petiolate; blades broadly to narrowly lanceolate, oblong-ovate, ovate-lanceolate, or round, 4–22 × 1–6 cm, (bases obtuse or cuneate to truncate) margins usually entire, sometimes sparsely denticulate, faces scantily to moderately pilose (hairs white), adaxial sparsely stipitate-glandular (distal cauline leaves sessile, extremely reduced, nearly linear to narrowly elliptic-lanceolate). |
2–4 pairs (basal often persistent on sterile rosettes), mostly cauline; petiolate (at least basal) or sessile; blades oblanceolate to spatulate, 2–7 × 0.5–2.5 cm, margins usually entire, sometimes denticulate, rarely dentate, apices usually acute, sometimes obtuse, faces sparsely puberulent, moderately pubescent distally, stipitate-glandular. |
Involucres | turbinate to narrowly campanulate. |
turbinate-campanulate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
6–10; corollas yellow. |
Disc florets | 20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
corollas yellow; anthers yellow. |
Phyllaries | 8–20, linear to narrowly lanceolate. |
9–15, linear-oblong to narrowly lanceolate. |
Heads | (1–)3–9(–14; often nodding in bud). |
1–3(–5). |
Cypselae | brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose. |
brown, 4–7 mm, densely hirsute (not stipitate-glandular); pappi white, bristles barbellate. |
2n | = 38, 57, 76. |
= 38, 76. |
Arnica parryi |
Arnica rydbergii |
|
Phenology | Flowering May–Sep. | Flowering Jul–Aug. |
Habitat | Open conifer forests to alpine meadows | Dry to mesic, exposed, rocky alpine slopes and ridges or alpine meadows |
Elevation | 500–3800 m [1600–12500 ft] | 1200–3400 m [3900–11200 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
CO; ID; MT; OR; UT; WA; WY; AB; BC
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 371. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Greene: Pittonia 4: 36. (1899) |
Web links |